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Contractual Obligations and Off-Balance Sheet Items - Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances (Details) - Guarantee Obligations [Member] $ in Thousands	Sep. 30, 2024 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 2,419,685
More than 1 year but less than 3 years	928,473
3 years or more but less than 5 years	174,544
5 years or more	1,364,417
Total	4,887,119
Payment Guarantee [Member] | Bank Term Funding Program [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	4,086,149
Total	$ 4,086,149

X

- Definition

Contractual obligations and off balance sheet items.

+ References

No definition available.

+ Details

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Namespace Prefix:	pb_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

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X

- Definition

Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fourth and fifth fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in second and third fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Details

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- Details

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